He is in the UK.
http://forum.6502.org/viewtopic.php?p=85621#p85621
and
RIOT - old school for Ram / IO / Timer
Thanks,
I sent a PM.
never heard back.
Check out a listing on eBay for R6532 chips.
At 3 bucks a piece plus 5 bucks shipping from China, fairly cheap and may be worth the risk.
There are frequent discussions on that forum about counterfeit or intentionally re/mislabeled parts.
The consensus is to test unknown parts before exposing hardware you value.